The non-Allin SA .45-702s (LVB, WH, and CR) all took the service bayonet, with the exception of the Hotchkiss Navies, which had a larger barrel, and took a specially swaged socket - M1873 won't go on, and the M1855/70 is way too loose.
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Dick,
You'll remember from other discussions elsewhere that New York dealer James Frazier also assembled trapdoors in the 1880s, and that Schuyler, Hartley & Graham had Remington making up trapdoors with new barrels in the 1890s. They looked like standard arms and took standard bayonets. And I have handled a trapdoor carbine marked on the barrel "Whitney Arms Company." Ed
Photos can deceive. I was seeing something (longer socket) that was not there. Measuring is more reliable.
Well, it still looks "long" to me (and it may be) but you are right about measuring - of course all that is required to produce a proper muzzle alignment is that the "front" dimensions be congruent - the total socket length, unless it fouled the tip, would not matter.